Abstract: A process for manufacturing a cathodoluminescent capsule including at least one envelope, a cold cathode, an anode and a grid. The process comprises at least the steps of: depositing luminophore and reflective layers on an internal wall; depositing a conductive layer at least contacting the luminophore layer; providing a cap having a tube including at least three metal conductors, each being respectively welded to the anode, cathode and grid; assembling the cap with the envelope so as to form the capsule, the anode being in contact with the conductive layer and the luminophore layer opposed to the cathode; vacuuming the capsule via the tube; sealing the capsule by closing an end of the cap tube.